IRKUTSK, Russia (CNN) -- A huge Russian military transport
plane crashed into a residential area of the Siberian city of
Irkutsk-2 Saturday, killing at least 46 people on board and as
many as 100 civilians on the ground.

Russian authorities
dispatched hundreds of rescue workers and investigators to
Irkutsk-2, a satellite town of the city of Irkutsk, about 5,000
kilometers (3,000 miles) east of Moscow.

Russian President Boris Yeltsin has ordered an investigation
into the crash. A Russian air force spokesman told CNN that the
plane might have crashed because it was overloaded.

Military prosecutors had also begun a criminal investigation
into the cause of the disaster. Officials were quoted as saying
the probe would focus on the possible "violation of flight
rules or of flight preparation rules."

The Defense Ministry said the four-engine Antonov-124 -- one
of the world's largest planes -- was carrying 46 crew members.
According to the Interfax News Agency its cargo was two Sukhoi
jet fighters from the Irkutsk factory for export to Vietnam.

It crashed about 20 seconds after takeoff at about 9:45 a.m.
after the two left engines failed.

The plane -- spewing blazing wreckage -- barreled along the
town's main street and slammed into a four-story apartment bloc
containing 48 apartments, which was engulfed by flames. Five
houses were also destroyed.

According to Russian Interfax news agency, the flight was
scheduled to go to Vladivostok in the Russian Far East, then on
to Vietnam. Weather at the time was described as good.

In addition to the approximately 100 people killed on the
ground, estimates were that perhaps another 100 were injured.
Rescue crews pulled at least 12 people from the debris and took
them to local hospitals. About 150 children from a nearby
kindergarten were evacuated.

Some 700
firefighters, soldiers and medical personnel with heavy machinery
searched for survivors in the surrounding buildings. Rescue teams
with sniffer dogs were sent to Irkutsk to assist in the hunt.

The plane had about 100 tons of fuel in its tanks when it
crashed and the resulting explosion and fire enveloped the area,
according to local officials.

Prime Minster Viktor Chernomyrdin was expected to visit the
disaster scene, and Air Force Commander Pyotr Deinekin was on his
way to Irkutsk.